Résumé: Widely linear (WL) receivers have the capability to
perform single antenna interference cancellation (SAIC) of one
rectilinear (R) or quasi-rectilinear (QR) co-channel interference
(CCI), a function which is operational in global system for mobile
communications (GSM) handsets in particular. Moreover, SAIC
technology for QR signals is still required for voice services over
adaptive multiuser channels on one slot (VAMOS) standard, a recent
evolution of both GSM and enhanced data rates for GSM
evolution (EDGE) standards, to mitigate legacy GSM CCI in particular.
It is also required for filter bank multicarrier offset quadrature
amplitude modulation (FBMC-OQAM) networks, which are
candidate for 5G mobile networks, to mitigate intercarrier interference
at reception for frequency selective propagation channels
in particular. In this context, the purpose of this paper is twofold.
The first one is to get more insights into the existing SAIC technology,
and its extension to multiple antenna called multiple antenna
interference cancellation (MAIC), by showing analytically that,
contrary to what is accepted as true in the literature, SAIC/MAIC
implemented from standard WL filtering may be less efficient for
QR signals than for R ones. From this result, the second purpose of
the paper is to propose and to analyze, forQRsignals and frequency
selective fading channels, an SAIC/MAIC enhancement based on
a three-input WL frequency shift receiver, making QR signals always
almost equivalent to R ones for WL filtering in the presence
of CCI. The results of the paper, completely new, may contribute
to develop elsewhere new powerful WL receivers for QR signals
and for both VAMOS and FBMC-OQAM networks in particular